Widevine Technologies have just announced that they have added Flash video to their list of supported video formats for their Cypher DRM technology. You can read the full press release here.
I'm not sure which approach Widevine's product takes but the company claims that Cypher 'is the first and only DRM solution that offers consumers the freedom to choose their entertainment platform while protecting the copyright and revenue streams of content owners and distributors'.
I've requested some more information but somehow doubt that this is a service which can be trialed by people like you and me ;-)